Shear behavior of sand-smooth geomembrane interfaces through micro-topographical analysis

Interface shear behavior of a shaft lining concrete-high density polyethylene material under different pre-imposed normal stresses

“…This phenomenon can result from the breaking down of local asperities into finer particles or from most particles having embedded themselves into the HDPE surfaces. Similar observations of shear behavior were reported in other studies [ 11 , 47 ]. The saw-toothed asperities of the concrete and HDPEs remain largely intact during shearing, which can be attributed to the high-strength concrete and elastic deformation of the HDPEs.…”

“…The residual state was attained in every sample under arbitrary normal stresses; for a given applied normal stress, the shear displacement corresponding to the peak shear strength increased with increases in the JRC. The present result is very similar to the interface behavior between sand and geomembrane [ 11 , 12 , 43 ], ballast-geosynthetic [ 44 ], geotextile and geomembrane [ 45 ].…”

“…Several previous studies have focused on the shear behaviors of the interfaces between civil engineering materials and HDPEs [ 10 – 19 ]. Vangla and Gali [ 11 ] conducted large scale shear tests on the interface between a smooth geomembrane and sands with varying particle sizes and morphology at different normal stresses, the results showed that morphology of the sands have major influence on the interface shear strength. The results of direct shear tests at the sand-geosynthetic interface conducted by Punetha et al [ 12 ] revealed that the shearing mechanism includes interlocking and fiber stretching while sliding, indentation and plowing for sand-geomembrane interface.…”

“…The shear strength mainly depends on the external load, joint roughness, shear rate, material property, and bonding state [ 11 – 16 , 19 – 22 ]. The surface morphology between HDPE and another material is an important factor in determining the integrality and service life of HDPE materials [ 23 ].…”

Laboratory Investigation of Shear Behavior of High-Density Polyethylene Geomembrane Interfaces

“…Over the past few decades, many direct shear tests have been conducted on GM interfaces [11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30], with various factors being considered during these tests. In the studies mentioned above, different types of standard-sized or large-scale direct shear apparatuses were employed to simulate some specific interface types, such as between a GM and soil, GT, or GCL.…”